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As a part of studies on MDR reversing agents, the structure of a benzylamido-9,10-dihydro-9,10-ethenoanthracene is reported: C24 H19 N O; orthorhombic; space group: Pca21; a = 9.214(2), b = 18.624(4), c = 10.170(2) Å; 1745.2(6) Å3; Z = 4. The three nonplanar rings from the 9,10-dihydro-9,10-ethenoanthracene skeleton of the molecule adopt a boat conformation. The benzamide side-chain is extended (conformation, trans-trans-gauche). The molecules in the crystal are joined by infinite chains of H-bonds N14–H14···O13.